I'm still thinking about this... beyond the actual incident but the implications and all...

before boarding an airplane you wait in an area designated. IF they had also just arrived from Quito, Ecuador (as suggested) then you might not even be allowed into the entire airport, not at MIA, because Miami is not your final flight destination...... even so... air marshalls are supposed to be viewing passengers prior to boarding, too... right?

If it was a situation because he was off his meds, then the situation didn't just occur during the walking the jetway to the plane! This situation was one of someone -a couple- "falling through the cracks." I'm sorry someone died... but it might save many in the future, as it exposes still the need for better marshalling.

BTW I can't find anything in the symptoms of bipolar disorder about 'hallucinations'.... so let's drop that, ok? He was angry... the wife said they had had an argument...

There just doesn't seem to be any way to improve response in this... you know? Other than they "should have been" aware of an impending situation with him prior to boarding, imo. There were 2 marshalls boarding with them... grrrrrrrrrrrrr